Improvement in hoisting-blocks



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JOSEPH A. BURR, OF BROOKLYN, N. Y., ASSIGNOR TO BURR & CO 0F- NEW YORK CITY.

Letters Patent No. 108,446, dated October 18,718?,

IMPROVEMENT IN HOlS'l'lNG-BLOCKHS.V

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern.-

Be it known that I, Josnru A. BURR, ot' Brook-V lynKings county, New York, have invented, made,

and applied to use'certain new and useful Improvcments in the Construction of Pulley-Blocks, and that the following isa full, clear, and correct description of my invention, reference being had tothe accompanying drawings making partof this specification,

'and to the lett-ers of reference' marked thereon, in

provements, as more fully hereinafter set forth, in thc construction of pulley-b1ocks.

The object of my invention is to furnish a strong block at a less cost than the weakestcan now be produced for.

There are two distinct kinds of blocks now in use, namely, those strapped or bound with iron, which are the strongest and most expensive, and those strapped or boundwith rope, which are much weaker and less expensive. y

'lo furnish a mean between these two is the object of my invention.

In the drawings- A represents the shell;

B the sheave;

C the sheave-pin D the lower end piece; and

E the upper end piece, which in my block I construct of metal.

F is the hook or fastening of the block, and G G are rivets which hold the metallic end piece to the shell, and through the shell to the sheave-pin and shcave.

In the patent granted Waterman S5 Russell in 1844, the hook is fast-end to a strap of metal which passes down through the inside of the shell, and the sheave-pin passes'through this strap. This made the strongest known block.

I make no claim to any metallic connection between the `hook and sheavepiu,which is covered in said patent.,

I construct my bloc-k with an ordinary wooden shell, and with the same sheave and sheave-pin as is used in the ordinary block. The lower end piece is also constructed in theoldway. The upperend piece I ,construct of cast-iron, or other metal. Through this end piece the rods are passed, and securely riveted on their ends, thus securing the metallic end piece tothe shell of the block; thence the work is transferred to the pin and sheave. Into the metallic end piece the hook or fastening is secured in any convenient manner.

This makes -a block of considera-ble strength, which purposes described.

JOSEPH A. BURR.

"itnesses I A. SIDNEY DOAXE, JOHN GnAs'rAErER. 

